JPS636997A - Attenuator - Google Patents

Abstract

PURPOSE:To effectively listen to the alarm whistle of a facing car by automatically attenuating the acoustic output of an acoustic system in a constant period after an alarm whistle is operated. CONSTITUTION:There are provided an input circuit INP in which an input end is connected to the connecting point of the coil CL1 of a relay RL1 for the alarm whistle having one end connected to a constant voltage source Vcc and the other end earthed through a depressing button-switch SW1 and the depressing button-switch and a first signal is outputted from an output end when the depressing button-switch is depressed, a timer circuit TM in which an input end is connected to the output end of the input circuit and a second signal is outputted from an output end when the first signal is inputted and an output circuit OUP in which an input end is connected to the output end of the timer circuit and an attenuation resistance is inserted to the speaker of the acoustic system AUD according to the second signal. Thereby, the attenuation resistance is automatically inserted to the speaker of the acoustic system by depressing the depressing button-switch of an alarming device to attenuate the acoustic output and make a driver listen to the alarm whistle of the facing car effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the invention [Field of industrial application] The present invention relates to a damping device, and more particularly, to a damping device that is attached to a sound system mounted on an automobile, and which dampens the sound system during a certain period of time after the horn is operated. The present invention relates to an attenuation device that automatically attenuates acoustic output.

[Prior Art] Conventionally, this type of damping device has not been attached to a sound system mounted on an automobile.

Therefore, drivers have to manually attenuate the sound output of the sound system in order to ensure that they can hear the horn of an oncoming vehicle and avoid an accident even in places with poor visibility.

[Problems to be Solved] However, in this case, driving on a meandering mountain road is complicated and burdensome to the driver.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a damping device that automatically attenuates the sound output of a sound system for a certain period of time after the horn is operated, thereby making it possible to reliably hear the horn of an oncoming vehicle.

(2) Structure of the Invention [Means for Solving Problems] To achieve this, the present invention provides (a) a coil for a horn relay whose one end is connected to a constant voltage source and whose other end is grounded via a pushbutton switch; (b) an input circuit whose input end is connected to a connection point with the pushbutton switch, and outputs a first signal from the output end when the pushbutton switch is pressed; (c) a timer circuit whose input terminal is connected to the output terminal of the timer circuit, and which outputs a second signal from the output terminal when the first signal is input; The problems of the prior art are solved by a damping device characterized by comprising an output circuit for inserting a damping resistor into a speaker of an audio system in response to a second signal.

"Operation" The damping device of the present invention automatically inserts a damping resistor into the speaker of the sound system to attenuate the sound output when the push button switch of the whistle stirrup is suppressed. It works to ensure that car horns can be heard.

[Example] Next, the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing an embodiment of the attenuation device of the present invention. FIGS. 2 and 3 are explanatory diagrams of the same operation, respectively.

First, the structure of the damping device of the present invention will be explained in detail.

S W + is a push button switch for driving the car's horn system 21 K L, and the negative contact is the relay R for the horn.
It is connected to the constant voltage source V'cc via the coil CL of L, and the other contact is grounded.

RG is a constant voltage regulator that serves as a constant voltage source for the attenuation device of the present invention, and its first terminal or input terminal is connected to the constant voltage source Vcc, and its second terminal is grounded. , outputs a constant voltage of 5V as the third terminal or output terminal.

TR, is a PNP type transistor included in the input circuit INP of the attenuation device of the present invention, whose emitter is connected to the third terminal, that is, the output terminal of the constant voltage regulator RG, and whose base is connected to the input terminal of the input circuit INP. Through a series circuit of a resistor R8 and a switch SW2, the pushbutton switch SW and the coil CL of the horn relay RL+ are connected to which connection point and the collector or output terminal of the input circuit INP is connected. It is said that

C is a capacitor included in the timer circuit TM.

- one terminal is connected to the collector of the transistor TR through a resistor R2, and the other terminal is grounded, and is charged through the resistor R2 when the transistor TR is conductive.

functions as a charging/discharging circuit that is discharged via the parallel-connected resistor R3 when the resistor R3 is non-conductive.

OP is an operational amplifier circuit that is included in the timer circuit TM and functions as a comparison circuit, and is connected to the first input terminal, that is, the ten input terminal, or to the connection point between the resistor R2 and the capacitor C,
A second input terminal, that is, one input terminal is connected to the output terminal of the constant voltage regulator RG via a resistor R1 and grounded via a resistor R5, and the output terminal is connected to the output terminal of the constant voltage regulator RG via a resistor R5.
It functions as the output terminal of M. SW, is timer circuit T
The switch for the manual set included in M is -
One contact is connected to the output terminal of constant voltage regulator RG, and the other contact is connected to capacitor C via resistor R2. SW is a manual reset switch included in the timer circuit TM, and enables the first input terminal of the operational amplifier circuit OP to be grounded via a resistor R6.

TR, is an NPN type transistor included in the output circuit OUP, which is connected to the constant ' and wIE source V e e through the collector or the coil CL x of the relay RL, and is connected to the base or Jll as the input terminal of the output circuit OUP. , tFs resistance R
7 to the output terminal of the operational amplifier circuit OP, that is, the output terminal of the timer circuit TM, and its emitter is grounded. SP is the speaker of the audio system AUD installed in the car, and is a relay contact r that is opened and closed by the coil CL2 of the relay RL2 included in the output circuit OUP.
12 and a damping resistor R6 in parallel to the main circuit M of the audio system AUD, and the other end is directly connected to the main circuit M.

Furthermore, the operation of the damping device of the present invention will be explained in detail.

Switch SW2 is closed, ie, on, and switches SW3 and SW4 are opened, ie, off.

In this state, press the pushbutton switch SWl of the horn device KL to turn it on, and then turn on the coil CL of the commonly used σ-RL1.
, to sound the horn (Fig. 2(a), 3).
(See figure (a)).

In the input circuit INF, as the voltage level at the connection point between the pushbutton switch SWl and the coil CL of the horn relay RL drops, the switch SW2 is applied to this connection point.
The voltage level at the base of the transistor TR connected through the series circuit of the resistor R1 also drops. When the voltage difference between the base and emitter exceeds a predetermined value, the transistor T
R becomes conductive, that is, turned on, and the voltage level at its collector rises and remains at a high level until the pushbutton switch SWl is opened (Fig. 2 (b), Fig. 3 (
b)). The collector voltage of the transistor TR is output as a first signal to the timer circuit TM.

In the timer circuit TM, as the first signal and hence the collector voltage of the transistor TR reach a high level, the capacitor C charges, t! , the level of the voltage is gradually increased, and then the first signal and hence the transistor T
When the collector voltage of R is removed, it is gradually lowered according to a time constant determined by capacitor C and resistor R.

This allows it to be used as a comparison circuit! The voltage level applied to the first input terminal of the operational amplifier circuit OP that functions as
The voltage level vRE of the reference voltage applied to the second input terminal changes according to changes in the charging voltage of the capacitor C.
F for a certain period of time, for example, several minutes (see FIGS. 2(c) and 3(c)). As a result, a high level voltage or a second signal is output from the output terminal of the operational amplifier circuit OP only during that period (Fig. 2(d), Fig. 3(d)
)reference). Therefore, the attenuation device of the present invention is capable of determining whether the pushbutton switch SW1 is pressed at least twice or more consecutively within a certain period of time by appropriately setting the reference voltage of the capacitor C1 and the resistor R1 or the operational amplifier circuit OP. The timer circuit TM is configured to output an output, that is, a second signal, for a certain period of time, for example, several minutes, only when the button is pressed continuously for a long time.
First, the damping device of the IJl of the present invention is avoided from being operated in areas with good visibility, such as in urban areas where horns are not frequently used.

In the output circuit OUP, the second signal and therefore the high level output voltage of the timer circuit TM, that is, the operational amplifier circuit O
With the high level output voltage of P, transistor T R2
A high level voltage is applied to the base of the circuit through a resistor R7. Therefore, the voltage difference between the pace emitters of the transistor TR2 exceeds a predetermined value, and the transistor TR2 enters the conductive state y3, that is, the off state (Fig. 2(e), Fig. 3(
(see e)), along with this, the coil CL of relay RL 2
.

An appropriate amount of qa is caused to flow, and the relay contact r12 is opened.

In the audio system AUD, when the relay contact r12 is opened, the necessary audio signal is given to the speaker SP from the main circuit M of the audio system AUD via the attenuation resistor R6, so that the audio output from the speaker SP is It is automatically attenuated (Fig. 2 (f), 3rd (2 (
(see f)), this allows the driver or oncoming vehicle to easily hear the horn.

When the switch SW is closed, that is, turned on, the capacitor C is charged through the resistor R2, so a high level voltage is output from the operational amplifier circuit OP for a certain period of time, and the speaker SP is then turned on as described above. The sound output is reduced. In other words, even if the pushbutton switch SWl of the horn system 21KL is not pressed at all, the switch S
Even if W2 is in an open state, that is, in an off state, the acoustic output of the speaker SP can be attenuated for a certain period of time by pressing the switch SW. Therefore, if desired, the driver can operate the damping device of the present invention independently of pressing the L push button switch SW on the horn device.

When the switch SW4 is closed, that is, turned on, the capacitor C is discharged in a short time and the operational amplifier circuit OP is turned on.
Since the charging voltage can be prevented from being at a higher level than the reference voltage applied to the first input terminal of As is clear, the acoustic output of the speaker SP is not attenuated. In other words, even if the push button switch SW of the horn device KL is suppressed and the switch SW2 is in the closed state, that is, in the ON state, the switch SW is not attenuated. Even if , is suppressed, the acoustic output of speaker SP is not attenuated. Therefore, if desired, the driver can deactivate the damping device δ of the present invention by depressing the switch SW4.

If the switch SW2 is set to an open state, that is, an off state,
Even if the pushbutton switch SW1 of the horn system fiKL is pressed, a high level voltage cannot be applied to the input circuit INP of the attenuation device of the present invention, so the attenuation device of the present invention is kept in a non-operating state. .

As is clear from the above, the switch S may be used as desired.
Remove W2, and replace the resistor R, the cylinder relay RL, the coil CL□, and the pushbutton switch SW.

It may also be possible to connect directly to the connection point.

Furthermore, if desired, at least one of the switch SW Yu, the switch SW4, and the resistor R14 may be removed.

(3) Effects of the Invention As is clear from the above, the damping device of the present invention includes: (a) a coil for a horn relay whose one end is not connected to a constant voltage source and whose other end is grounded via a push button switch; (b) an input circuit whose input end is connected to a connection point with the pushbutton switch, and outputs a first signal from the output end when the pushbutton switch is pressed; a timer circuit whose ends are connected and outputs a second signal from the output end when the first signal is input;
(c) an output circuit having an input end connected to the output end of the timer circuit and inserting a damping resistor into a speaker of the audio system in response to the second signal;
(1) It has the effect of automatically attenuating the sound output of the sound system when the horn sounds, and (2) it also has the effect of ensuring safety by ensuring that the horn of an oncoming vehicle can be heard.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the attenuation device of the present invention, and FIGS. 2 and 3 are diagrams each illustrating the same operation. AUD・・・・・・・・・Acoustic system C...
・・・・・・・・・・・・Capacitor CL,, CL,
...Coil INP...Input circuit KL...
・・・・・・・・・Honk device M・・・・・・・・・・
・・・－・・・Main circuit oP・・・・・・－・－・・・・・・
Operational amplifier circuit OUP・・・・・・・・・Output circuit R1~R,・・・・・・Resistance RG・・・・・・・・・・・・・・・Constant voltage regulator RL ,,RL,...Relay r12...Contact SP...Speaker SW1~S
W4... Switch TM... Timer circuit TR+
, TR2...Transistor patent applicant NOK Co., Ltd. agent Patent attorney Kudo
Takao Figure 2

Claims (6)

[Claims] (1) (a) One end is connected to a constant voltage source and the other end is grounded via a pushbutton switch, and the input end is connected to the connection point between the coil of the horn relay and the pushbutton switch. , an input circuit that outputs a first signal from an output end when the pushbutton switch is pressed; (b) an input end is connected to the output end of the input circuit, and the first signal is inputted; (c) an input terminal is connected to the output terminal of the timer circuit, and a damping resistor is applied to a speaker of the audio system in response to the second signal; An attenuation device characterized by comprising an output circuit to be inserted. (2) The timer circuit includes (a) a charging/discharging circuit connected to an output terminal of an input circuit; (b) one input terminal is connected to the charging/discharging circuit, and the charging voltage of the charging/discharging circuit is connected to the other. and a comparator circuit that outputs a predetermined voltage as a second signal from the output terminal when the voltage reaches a higher level than the reference voltage applied to the input terminal of the (1
) Attenuation device described in paragraph 2. (3) Claim (2) characterized in that a first switch is disposed between the charging/discharging circuit and the voltage source.
Attenuation device as described in section. (4) The attenuation device according to claim (2) or (3), characterized in that a second switch is arranged in parallel to the charging/discharging circuit. (5) The output circuit includes a transistor whose base is connected to the output end of the timer circuit, and a relay having a coil inserted in series with the collector of the transistor and a contact connected in parallel to the damping resistor. A damping device according to any one of claims (1) to (4), characterized in that: (6) The input end of the input circuit is connected to the connection point between the coil of the horn relay and the pushbutton switch via a third switch.
The attenuation device according to any one of items 1) to (5).